CBSE  /  Class 8  /  Science  /  Friction

  • 1. 
    In which of the following friction is helpful:

  • the engine of car becomes hot after running for some time
  • soles of shoes were out after sometime
  • pulling a drawer out of a desk
  • using a towel to open a tightly closed lid of a bottle

  • 2. 
    Function can be reduced by:

  • using lubricants
  • polishing
  • using fine powder
  • all of these

  • 3. 
    Drag is:

  • frictional force exerted by solids
  • frictional force exerted by liquids
  • frictional force exerted by gases
  • frictional force exerted by fluids

  • 4. 
    When one body roth over the surface of another body, the resistance to Its motion is called:

  • sliding friction
  • rolling friction
  • static friction
  • none of these

  • 5. 
    Friction the rehuye motion between Io surfaces In contact.

  • favours
  • opposes
  • is
  • none of these

  • 6. 
    To increase friction:

  • the surface is made smooth
  • the surface is polished
  • the surface is made rough
  • powder is sprinkled on the surface

  • 7. 
    Which of the following has least friction:

  • rolling friction
  • static friction
  • sliding friction
  • none of these

  • 8. 
    Ball hearing:

  • reduces friction
  • increases friction
  • make no change in friction
  • none of these

  • 9. 
    Drag is:

  • frictional force exerted by solids
  • frictional force exerted by fluids
  • both (a) and (b)
  • none of these

  • 10. 
    The frictional force of smooth surface is:

  • less
  • more
  • zero
  • none of these
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